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<h1 class="title">satellitemodel.cpp Example File</h1>
<span class="subtitle">satelliteinfo/satellitemodel.cpp</span>
<!-- $$$satelliteinfo/satellitemodel.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"><span class="comment">/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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****************************************************************************/</span>
<span class="preprocessor">#include "satellitemodel.h"</span>
<span class="preprocessor">#include <QTimer></span>
<span class="preprocessor">#include <QDebug></span>
SatelliteModel<span class="operator">::</span>SatelliteModel(<span class="type">QObject</span> <span class="operator">*</span>parent) :
<span class="type">QAbstractListModel</span>(parent)<span class="operator">,</span> source(<span class="number">0</span>)<span class="operator">,</span> m_componentCompleted(<span class="keyword">false</span>)<span class="operator">,</span> m_running(<span class="keyword">false</span>)<span class="operator">,</span>
m_runningRequested(<span class="keyword">false</span>)<span class="operator">,</span> demo(<span class="keyword">false</span>)<span class="operator">,</span> isSingle(<span class="keyword">false</span>)<span class="operator">,</span> singleRequestServed(<span class="keyword">false</span>)
{
source <span class="operator">=</span> <span class="type"><a href="qgeosatelliteinfosource.html">QGeoSatelliteInfoSource</a></span><span class="operator">::</span>createDefaultSource(<span class="keyword">this</span>);
<span class="keyword">if</span> (<span class="operator">!</span>demo <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>source) {
qWarning() <span class="operator"><</span><span class="operator"><</span> <span class="string">"No satellite data source found. Changing to demo mode."</span>;
demo <span class="operator">=</span> <span class="keyword">true</span>;
}
<span class="keyword">if</span> (<span class="operator">!</span>demo) {
source<span class="operator">-</span><span class="operator">></span>setUpdateInterval(<span class="number">3000</span>);
connect(source<span class="operator">,</span> SIGNAL(satellitesInViewUpdated(<span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(satellitesInViewUpdated(<span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">></span>)));
connect(source<span class="operator">,</span> SIGNAL(satellitesInUseUpdated(<span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(satellitesInUseUpdated(<span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">></span>)));
connect(source<span class="operator">,</span> SIGNAL(error(<span class="type"><a href="qgeosatelliteinfosource.html">QGeoSatelliteInfoSource</a></span><span class="operator">::</span>Error))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(error(<span class="type"><a href="qgeosatelliteinfosource.html">QGeoSatelliteInfoSource</a></span><span class="operator">::</span>Error)));
}
<span class="keyword">if</span> (demo) {
timer <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QTimer</span>(<span class="keyword">this</span>);
connect(timer<span class="operator">,</span> SIGNAL(timeout())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateDemoData()));
timer<span class="operator">-</span><span class="operator">></span>start(<span class="number">3000</span>);
}
}
<span class="type">int</span> SatelliteModel<span class="operator">::</span>rowCount(<span class="keyword">const</span> <span class="type">QModelIndex</span> <span class="operator">&</span>parent) <span class="keyword">const</span>
{
Q_UNUSED(parent);
<span class="keyword">if</span> (<span class="operator">!</span>source <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>demo)
<span class="keyword">return</span> <span class="number">0</span>;
<span class="keyword">return</span> knownSatellites<span class="operator">.</span>count();
}
<span class="type">QVariant</span> SatelliteModel<span class="operator">::</span>data(<span class="keyword">const</span> <span class="type">QModelIndex</span> <span class="operator">&</span>index<span class="operator">,</span> <span class="type">int</span> role) <span class="keyword">const</span>
{
<span class="keyword">if</span> (<span class="operator">!</span>demo <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>source)
<span class="keyword">return</span> <span class="type">QVariant</span>();
<span class="keyword">if</span> (<span class="operator">!</span>index<span class="operator">.</span>isValid() <span class="operator">|</span><span class="operator">|</span> index<span class="operator">.</span>row() <span class="operator"><</span> <span class="number">0</span>)
<span class="keyword">return</span> <span class="type">QVariant</span>();
<span class="keyword">if</span> (index<span class="operator">.</span>row() <span class="operator">></span><span class="operator">=</span> knownSatellites<span class="operator">.</span>count()) {
qWarning() <span class="operator"><</span><span class="operator"><</span> <span class="string">"SatelliteModel: Index out of bound"</span>;
<span class="keyword">return</span> <span class="type">QVariant</span>();
}
<span class="keyword">const</span> <span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span> <span class="operator">&</span>info <span class="operator">=</span> knownSatellites<span class="operator">.</span>at(index<span class="operator">.</span>row());
<span class="keyword">switch</span> (role) {
<span class="keyword">case</span> IdentifierRole:
<span class="keyword">return</span> info<span class="operator">.</span>satelliteIdentifier();
<span class="keyword">case</span> InUseRole:
<span class="keyword">return</span> satellitesInUse<span class="operator">.</span>contains(info<span class="operator">.</span>satelliteIdentifier());
<span class="keyword">case</span> SignalStrengthRole:
<span class="keyword">return</span> info<span class="operator">.</span>signalStrength();
<span class="keyword">case</span> ElevationRole:
<span class="keyword">if</span> (<span class="operator">!</span>info<span class="operator">.</span>hasAttribute(<span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">::</span>Elevation))
<span class="keyword">return</span> <span class="type">QVariant</span>();
<span class="keyword">return</span> info<span class="operator">.</span>attribute(<span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">::</span>Elevation);
<span class="keyword">case</span> AzimuthRole:
<span class="keyword">if</span> (<span class="operator">!</span>info<span class="operator">.</span>hasAttribute(<span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">::</span>Azimuth))
<span class="keyword">return</span> <span class="type">QVariant</span>();
<span class="keyword">return</span> info<span class="operator">.</span>attribute(<span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">::</span>Azimuth);
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
<span class="keyword">return</span> <span class="type">QVariant</span>();
}
<span class="type">QHash</span><span class="operator"><</span><span class="type">int</span><span class="operator">,</span> <span class="type">QByteArray</span><span class="operator">></span> SatelliteModel<span class="operator">::</span>roleNames() <span class="keyword">const</span>
{
<span class="type">QHash</span><span class="operator"><</span><span class="type">int</span><span class="operator">,</span> <span class="type">QByteArray</span><span class="operator">></span> roleNames;
roleNames<span class="operator">.</span>insert(IdentifierRole<span class="operator">,</span> <span class="string">"satelliteIdentifier"</span>);
roleNames<span class="operator">.</span>insert(InUseRole<span class="operator">,</span> <span class="string">"isInUse"</span>);
roleNames<span class="operator">.</span>insert(SignalStrengthRole<span class="operator">,</span> <span class="string">"signalStrength"</span>);
roleNames<span class="operator">.</span>insert(ElevationRole<span class="operator">,</span> <span class="string">"elevation"</span>);
roleNames<span class="operator">.</span>insert(AzimuthRole<span class="operator">,</span> <span class="string">"azimuth"</span>);
<span class="keyword">return</span> roleNames;
}
<span class="type">void</span> SatelliteModel<span class="operator">::</span>componentComplete()
{
m_componentCompleted <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">if</span> (m_runningRequested)
setRunning(<span class="keyword">true</span>);
}
bool SatelliteModel<span class="operator">::</span>running() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_running;
}
bool SatelliteModel<span class="operator">::</span>isSingleRequest() <span class="keyword">const</span>
{
<span class="keyword">return</span> isSingle;
}
<span class="type">void</span> SatelliteModel<span class="operator">::</span>setSingleRequest(bool single)
{
<span class="keyword">if</span> (running()) {
qWarning() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Cannot change single request mode while running"</span>;
<span class="keyword">return</span>;
}
<span class="keyword">if</span> (single <span class="operator">!</span><span class="operator">=</span> isSingle) { <span class="comment">//flag changed</span>
isSingle <span class="operator">=</span> single;
<span class="keyword">emit</span> singleRequestChanged();
}
}
<span class="type">void</span> SatelliteModel<span class="operator">::</span>setRunning(bool isActive)
{
<span class="keyword">if</span> (<span class="operator">!</span>source <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>demo)
<span class="keyword">return</span>;
<span class="keyword">if</span> (<span class="operator">!</span>m_componentCompleted) {
m_runningRequested <span class="operator">=</span> isActive;
<span class="keyword">return</span>;
}
<span class="keyword">if</span> (m_running <span class="operator">=</span><span class="operator">=</span> isActive)
<span class="keyword">return</span>;
m_running <span class="operator">=</span> isActive;
<span class="keyword">if</span> (m_running) {
clearModel();
<span class="keyword">if</span> (demo)
timer<span class="operator">-</span><span class="operator">></span>start(<span class="number">2000</span>);
<span class="keyword">else</span> <span class="keyword">if</span> (isSingleRequest())
source<span class="operator">-</span><span class="operator">></span>requestUpdate(<span class="number">10000</span>);
<span class="keyword">else</span>
source<span class="operator">-</span><span class="operator">></span>startUpdates();
<span class="keyword">if</span> (demo)
singleRequestServed <span class="operator">=</span> <span class="keyword">false</span>;
} <span class="keyword">else</span> {
<span class="keyword">if</span> (demo)
timer<span class="operator">-</span><span class="operator">></span>stop();
<span class="keyword">else</span> <span class="keyword">if</span> (<span class="operator">!</span>isSingleRequest())
source<span class="operator">-</span><span class="operator">></span>stopUpdates();
}
Q_EMIT runningChanged();
}
<span class="type">int</span> SatelliteModel<span class="operator">::</span>entryCount() <span class="keyword">const</span>
{
<span class="keyword">return</span> knownSatellites<span class="operator">.</span>count();
}
bool SatelliteModel<span class="operator">::</span>canProvideSatelliteInfo() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="operator">!</span>demo;
}
<span class="type">void</span> SatelliteModel<span class="operator">::</span>clearModel()
{
beginResetModel();
knownSatelliteIds<span class="operator">.</span>clear();
knownSatellites<span class="operator">.</span>clear();
satellitesInUse<span class="operator">.</span>clear();
endResetModel();
}
<span class="type">void</span> SatelliteModel<span class="operator">::</span>updateDemoData()
{
<span class="keyword">static</span> bool flag <span class="operator">=</span> <span class="keyword">true</span>;
<span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">></span> satellites;
<span class="keyword">if</span> (flag) {
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i<span class="operator"><</span><span class="number">5</span>; i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span> info;
info<span class="operator">.</span>setSatelliteIdentifier(i);
info<span class="operator">.</span>setSignalStrength(<span class="number">20</span> <span class="operator">+</span> <span class="number">20</span><span class="operator">*</span>i);
satellites<span class="operator">.</span>append(info);
}
} <span class="keyword">else</span> {
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i<span class="operator"><</span><span class="number">9</span>; i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span> info;
info<span class="operator">.</span>setSatelliteIdentifier(i<span class="operator">*</span><span class="number">2</span>);
info<span class="operator">.</span>setSignalStrength(<span class="number">20</span> <span class="operator">+</span> <span class="number">10</span><span class="operator">*</span>i);
satellites<span class="operator">.</span>append(info);
}
}
satellitesInViewUpdated(satellites);
flag <span class="operator">?</span> satellitesInUseUpdated(<span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">></span>() <span class="operator"><</span><span class="operator"><</span> satellites<span class="operator">.</span>at(<span class="number">2</span>))
: satellitesInUseUpdated(<span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">></span>() <span class="operator"><</span><span class="operator"><</span> satellites<span class="operator">.</span>at(<span class="number">3</span>));
flag <span class="operator">=</span> <span class="operator">!</span>flag;
<span class="keyword">emit</span> errorFound(flag);
<span class="keyword">if</span> (isSingleRequest() <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>singleRequestServed) {
singleRequestServed <span class="operator">=</span> <span class="keyword">true</span>;
setRunning(<span class="keyword">false</span>);
}
}
<span class="type">void</span> SatelliteModel<span class="operator">::</span>error(<span class="type"><a href="qgeosatelliteinfosource.html">QGeoSatelliteInfoSource</a></span><span class="operator">::</span>Error error)
{
<span class="keyword">emit</span> errorFound((<span class="type">int</span>)error);
}
<span class="keyword">inline</span> bool <span class="keyword">operator</span><span class="operator"><</span>(<span class="keyword">const</span> <span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">&</span> a<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">&</span> b)
{
<span class="keyword">return</span> a<span class="operator">.</span>satelliteIdentifier() <span class="operator"><</span> b<span class="operator">.</span>satelliteIdentifier();
}
<span class="type">void</span> SatelliteModel<span class="operator">::</span>satellitesInViewUpdated(<span class="keyword">const</span> <span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">></span> <span class="operator">&</span>infos)
{
<span class="keyword">if</span> (<span class="operator">!</span>running())
<span class="keyword">return</span>;
<span class="type">int</span> oldEntryCount <span class="operator">=</span> knownSatellites<span class="operator">.</span>count();
<span class="type">QSet</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span> satelliteIdsInUpdate;
foreach (<span class="keyword">const</span> <span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span> <span class="operator">&</span>info<span class="operator">,</span> infos)
satelliteIdsInUpdate<span class="operator">.</span>insert(info<span class="operator">.</span>satelliteIdentifier());
<span class="type">QSet</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span> toBeRemoved <span class="operator">=</span> knownSatelliteIds <span class="operator">-</span> satelliteIdsInUpdate;
<span class="comment">//We reset the model as in reality just about all entry values change</span>
<span class="comment">//and there are generally a lot of inserts and removals each time</span>
<span class="comment">//Hence we don't bother with complex model update logic beyond resetModel()</span>
beginResetModel();
knownSatellites <span class="operator">=</span> infos;
<span class="comment">//sort them for presentation purposes</span>
std<span class="operator">::</span>sort(knownSatellites<span class="operator">.</span>begin()<span class="operator">,</span> knownSatellites<span class="operator">.</span>end());
<span class="comment">//remove old "InUse" data</span>
<span class="comment">//new satellites are by default not in "InUse"</span>
<span class="comment">//existing satellites keep their "inUse" state</span>
satellitesInUse <span class="operator">-</span><span class="operator">=</span> toBeRemoved;
knownSatelliteIds <span class="operator">=</span> satelliteIdsInUpdate;
endResetModel();
<span class="keyword">if</span> (oldEntryCount <span class="operator">!</span><span class="operator">=</span> knownSatellites<span class="operator">.</span>count())
<span class="keyword">emit</span> entryCountChanged();
}
<span class="type">void</span> SatelliteModel<span class="operator">::</span>satellitesInUseUpdated(<span class="keyword">const</span> <span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span><span class="operator">></span> <span class="operator">&</span>infos)
{
<span class="keyword">if</span> (<span class="operator">!</span>running())
<span class="keyword">return</span>;
beginResetModel();
satellitesInUse<span class="operator">.</span>clear();
foreach (<span class="keyword">const</span> <span class="type"><a href="qgeosatelliteinfo.html">QGeoSatelliteInfo</a></span> <span class="operator">&</span>info<span class="operator">,</span> infos)
satellitesInUse<span class="operator">.</span>insert(info<span class="operator">.</span>satelliteIdentifier());
endResetModel();
}</pre>
</div>
<!-- @@@satelliteinfo/satellitemodel.cpp -->
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